Initial ClipPhrase implementation.
Calculating inflection point information.
Quick tests of inflection point callbacks.

Working as expected.
Inflection callback received Motion& parameter.
Untested Sequence::slice method.

Chops along time.
Successfully burning our tracks.

Like to Dola gang or Ouraboros.
burn -> cut.
Tests passing with named sequence.

Instead of using shared_ptr for the Motion's source sequence.
Samples running against changes.
ClipPhrase now clamps values.
Store inflection point as int.

Still get a whole lot of them, allows us to easily check when
they are invalid after slicing a sequence, since they won't wrap
around to ridiculously large values like size_t.
Merge pull request #9 from sansumbrella/named_sequence

Sequence Slicing